Implemented the CardContentLoader

- Implemented the CardContentLoader
- Refactored the CardLoader and increased the code readable
- Added try-with-resource
- Removed all custom card codes
- Modified ContextualCardManager to add CardContentLoaderCallbacks

Bug: 112521307
Test: robotest
Change-Id: Ieb9cdeaacdfb8fdae9747c60395206d15af034c1
5 files changed